package com.kevin.pay.utils;

import com.kevin.pay.domain.User;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;

public class JwtUtils {

    public static final String SUBJECT="xdclass";

    public static final long EXPIRE=1000*60*60*24*7;//过期时间

    public static final String APPSECRET="xd666";

    /**
     * 生成jwt
     * @param user
     * @return
     */
    public static String geneJsonWebToken(User user){
        if(user == null || user.getId() == 0 || user.getName() == null
                || user.getHeadImg()==null){
            return null;
        }
        String token= Jwts.builder().setSubject(SUBJECT)
                .claim("id",user.getId())
                .claim("name",user.getName())
                .claim("img",user.getHeadImg())
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis()+EXPIRE))
                .signWith(SignatureAlgorithm.HS256,APPSECRET).compact();
        return token;
    }

    /**
     * 校验token
     */
    public static Claims checkJWT(String token){
        Claims claims=Jwts.parser().setSigningKey(APPSECRET)
                .parseClaimsJws(token).getBody();
        return claims;
    }

}
